This is a CD that comes with the limited edition of Sola Color IV DVD.
I couldn't find track information anywhere, other than the song, so I made up the rest.
Song is a bit boring, but the lyric is okay (except for the strange English), and Mai-chan's singing is never annoying because her voice is so nice. Sound quality is pretty good for what we get these days. I'm not sure if I should be happy or sad.
Drama supplements the anime episodes on the DVD. It's probably better to watch the DVD first, but this particular episode is mostly a flashback, so it might not spoil anything.